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• W2019432504 abstract "Proximal tubules suitable for in vitro culture were prepared from rat kidney cortex by a Ficoll-gradient centrifugation technique which yielded greater than 94% purity. The tubules were seeded into culture dishes, and cell growth was monitored in both Dulbecco's Modified Eagle's Medium containing 10% fetal calf serum and in a defined medium consisting of 50:50 Ham's F12 and Dulbecco's supplemented with insulin, transferrin, and hydrocortisone. Growth in serum-containing medium was continuous; however, the specific activity of the brush border enzyme alkaline phosphatase decreased rapidly with time, and the culture morphology became fibroblastic by 6 days. Neither collagen-coating of the dishes nor addition of the differentiation inducer hexamethylene-bisacetamide had any significant effect on growth or enzyme activity of the cultured cells. Theophylline, another inducer of differentiation, proved cytotoxic. Growth of proximal tubule cells in defined medium proceeded for 4 days before irreversible growth arrest occurred. Alkaline phosphatase activity and epithelial morphology remained relatively constant throughout the culture period. Additions of the growth factors triiodothyronine, prostaglandin E2, and epidermal growth factor were unable to unblock the growth arrest. If cells cultured in defined medium for 3 days were switched to serum-supplemented medium, continuous growth occurred, but both alkaline phosphatase activity and epithelial morphology were rapidly lost. As a test of the culture method, rabbit proximal tubule cells were cultured under similar conditions in defined medium. Growth was prolific and continuous for up to, but not exceeding, 30 days, and differentiated properties were retained. It was concluded that both rat and rabbit proximal tubule cells have a limited proliferative capacity in vitro but that the capacity of the rat cell to divide is much reduced relative to the rabbit cell." @default.
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• W2019432504 title "Restricted growth of rat kidney proximal tubule cells cultured in serum-supplemented and defined media" @default.
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• W2019432504 doi "https://doi.org/10.1002/jcp.1041290219" @default.
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